That depends on how the reverse resolution of the IP address was delegated to you by the owner of the 50.30.14.0/24 block, which we can't know. I'd suggest you ask whoever assigned you that IP address. See RFC 2317 for an explanation of the most common setup. (Well, the most common is probably where whoever owns the /24 does the DNS for you and you just tell them the hostnames. But the common where the end user does it is RFC2317 style if you have less than a /24.)
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David SchwartzJan 15 '12 at 9:09

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You will add the option to translate your IP to a name. If you configure your reverse DNS in the wrong way, your A records will still work unless you start to mess with that zone. As on the how to test it, you can use dig to look for pointer records.

What problem will cause if I don't setup DNS Reverse? It seems that everything is OK, I can receive and send email, and can access website, why need I setup DNS Reverse ?
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PaulJan 15 '12 at 11:34

Reverse DNS is important for one particular application. Many e-mail servers on the Internet are configured to reject incoming e-mails from any IP address which does not have reverse DNS. So if you run your own e-mail server, reverse DNS must exist for the IP address that outgoing e-mail is sent from.
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Lucas KauffmanJan 15 '12 at 11:38